Full movie description "Person of Interest Matsya Nyaya":

With some hesitancy, Carter re-enters life with Reese and Finch, in part because she feels her police work may be in jeopardy since she doesn't know who in the force she can trust, with Fusco at the top of that list. Reese believes that it still is not the time to tell either Carter or Fusco of their relationships. Regardless, Carter is in place for work on the next number, that belonging to armored car security guard Tommy Clay, who they believe is the intended victim. Reese's belief of Tommy being victim is strengthened by seeing, while Reese works under him on the three person team, that the team is ill prepared if an attack was to happen on their vehicle. Reese is only half right. He and Finch will have to uncover Tommy's hidden relationships to find out who was responsible for the hit, which works its way back to Carter and Fusco's continuing problems. Meanwhile, flashbacks show Reese on his last job in 2010 with the CIA, which explain why Snow is so eager to find Reese now.